Or

In logic "or" means at least one is true.

They can both be true. But if none are true the result is "false".

Example:
When A is true and B is true then A or B is true
When A is false and B is true then A or B is true
When A is true and B is false then A or B is true
When A is false and B is false then A or B is false

Example: is grass green or red? Answer: yes.